Figure 4.

Racial disparities in quality of care within and between provider groups sufficiently large for ACO programs. For each quality measure, the total disparity among provider groups of sufficient size to participate in ACO programs (medium-sized and large groups) was decomposed into within-group differences in quality and differences in quality related to between-group differences in racial composition. The proportion of the total unadjusted racial disparity attributable to racial differences within provider groups ranged from 53 % [2.1/(2.1 + 1.9)] to 95 % [2.0/(2.0 + 0.1)] across quality measures, while differences between groups in the racial composition of assigned populations of beneficiaries accounted for the remaining 5 % to 47 %.